Subtract 30/9 from 81/40
1st number: 2 1/40, 2nd number: 3 3/9
81/40 - 30/9 is -157/120.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 40 and 9 is 360
Next, find the equivalent fraction of both fractional numbers with denominator 360 - For the 1st fraction, since 40 × 9 = 360,
81/40 = 81 × 9/40 × 9 = 729/360 - Likewise, for the 2nd fraction, since 9 × 40 = 360,
30/9 = 30 × 40/9 × 40 = 1200/360 - Subtract the two like fractions:
729/360 - 1200/360 = 729 - 1200/360 = -471/360 - After reducing the fraction, the answer is -157/120
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 81/40-60/9 81/80-30/9 81/40-30/18 81/40-90/9 81/40-30/27 81/40-30/45 81/40-30/63